## Lecture 5 Chapter 4 Determinants Class 12

“It’s not whether you get knocked down, it’s whether you get up.” – Vince Lombardi

# Lecture 5 Chapter 4 Determinants Class 12

00:00:05 Summary of exercise 4.3
00:02:54 NCERT Solutions Exercise 4.3 Question 3
Find values of k if area of triangle is 4 sq. units and vertices are (i) (k, 0), (4, 0), (0, 2) (ii) (–2, 0), (0, 4), (0, k)
00:08:14 NCERT Solutions Exercise 4.3 Question 5
If area of triangle is 35 sq units with vertices (2, – 6), (5, 4) and (k, 4). Then k is (A) 12 (B) –2 (C) –12, –2 (D) 12, –2
00:10:34 NCERT Solutions Exercise 4.3 Question 4
(i) Find equation of line joining (1, 2) and (3, 6) using determinants. (ii) Find equation of line joining (3, 1) and (9, 3) using determinants. Finding minors and cofactors of 2×2 and 3×3 determinants
00:23:04 NCERT Solutions Exercise 4.4 Question 1
00:28:34 NCERT Solutions Exercise 4.4 Question 2
Finding determinant using cofactors of any row or column
00:36:54 NCERT Solutions Exercise 4.4 Question 3